<?php
/**
 * TLogRouter, TLogRoute, TFileLogRoute, TEmailLogRoute class file
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2014 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @package System.Util
 */

Prado::using('System.Data.TDbConnection');

/**
 * TLogRouter class.
 *
 * TLogRouter manages routes that record log messages in different media different ways.
 * For example, a file log route {@link TFileLogRoute} records log messages
 * in log files. An email log route {@link TEmailLogRoute} sends log messages
 * to email addresses.
 *
 * Log routes may be configured in application or page folder configuration files
 * or an external configuration file specified by {@link setConfigFile ConfigFile}.
 * The format is as follows,
 * <code>
 *   <route class="TFileLogRoute" Categories="System.Web.UI" Levels="Warning" />
 *   <route class="TEmailLogRoute" Categories="Application" Levels="Fatal" Emails="admin@pradosoft.com" />
 * </code>
 * PHP configuration style:
 * <code>
 *
 * </code>
 * You can specify multiple routes with different filtering conditions and different
 * targets, even if the routes are of the same type.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @author Carl G. Mathisen <carlgmathisen@gmail.com>
 * @package System.Util
 * @since 3.0
 */
class TLogRouter extends TModule
{
	/**
	 * @var array list of routes available
	 */
	private $_routes=array();
	/**
	 * @var string external configuration file
	 */
	private $_configFile=null;

	/**
	 * Initializes this module.
	 * This method is required by the IModule interface.
	 * @param mixed configuration for this module, can be null
	 * @throws TConfigurationException if {@link getConfigFile ConfigFile} is invalid.
	 */
	public function init($config)
	{
		if($this->_configFile!==null)
		{
 			if(is_file($this->_configFile))
 			{
				if($this->getApplication()->getConfigurationType()==TApplication::CONFIG_TYPE_PHP)
				{
					$phpConfig = include $this->_configFile;
					$this->loadConfig($phpConfig);
				}
				else
				{
					$dom=new TXmlDocument;
					$dom->loadFromFile($this->_configFile);
					$this->loadConfig($dom);
				}
			}
			else
				throw new TConfigurationException('logrouter_configfile_invalid',$this->_configFile);
		}
		$this->loadConfig($config);
		$this->getApplication()->attachEventHandler('OnEndRequest',array($this,'collectLogs'));
	}

	/**
	 * Loads configuration from an XML element or PHP array
	 * @param mixed configuration node
	 * @throws TConfigurationException if log route class or type is not specified
	 */
	private function loadConfig($config)
	{
		if(is_array($config))
		{
			if(isset($config['routes']) && is_array($config['routes']))
			{
				foreach($config['routes'] as $route)
				{
					$properties = isset($route['properties'])?$route['properties']:array();
					if(!isset($route['class']))
						throw new TConfigurationException('logrouter_routeclass_required');
					$route=Prado::createComponent($route['class']);
					if(!($route instanceof TLogRoute))
						throw new TConfigurationException('logrouter_routetype_invalid');
					foreach($properties as $name=>$value)
						$route->setSubproperty($name,$value);
					$this->_routes[]=$route;
					$route->init($route);
				}
			}
		}
		else
		{
			foreach($config->getElementsByTagName('route') as $routeConfig)
			{
				$properties=$routeConfig->getAttributes();
				if(($class=$properties->remove('class'))===null)
					throw new TConfigurationException('logrouter_routeclass_required');
				$route=Prado::createComponent($class);
				if(!($route instanceof TLogRoute))
					throw new TConfigurationException('logrouter_routetype_invalid');
				foreach($properties as $name=>$value)
					$route->setSubproperty($name,$value);
				$this->_routes[]=$route;
				$route->init($routeConfig);
			}
		}
	}

	/**
	 * Adds a TLogRoute instance to the log router.
	 *
	 * @param TLogRoute $route
	 * @throws TInvalidDataTypeException if the route object is invalid
	 */
	public function addRoute($route)
	{
		if(!($route instanceof TLogRoute))
			throw new TInvalidDataTypeException('logrouter_routetype_invalid');
		$this->_routes[]=$route;
		$route->init(null);
	}

	/**
	 * @return string external configuration file. Defaults to null.
	 */
	public function getConfigFile()
	{
		return $this->_configFile;
	}

	/**
	 * @param string external configuration file in namespace format. The file
	 * must be suffixed with '.xml'.
	 * @throws TConfigurationException if the file is invalid.
	 */
	public function setConfigFile($value)
	{
		if(($this->_configFile=Prado::getPathOfNamespace($value,$this->getApplication()->getConfigurationFileExt()))===null)
			throw new TConfigurationException('logrouter_configfile_invalid',$value);
	}

	/**
	 * Collects log messages from a logger.
	 * This method is an event handler to application's EndRequest event.
	 * @param mixed event parameter
	 */
	public function collectLogs($param)
	{
		$logger=Prado::getLogger();
		foreach($this->_routes as $route)
			$route->collectLogs($logger);
	}
}